6518 Engine trouble

[MarksA-C 93]

Here are the latest updated on the newly named 6518 IT RUNS! Sorry, but no Action Pictures... [IMG]http://i145.photobucket.com/albums/r238/Marksac/DSCF0416.jpg[/IMG] [IMG]http://i145.photobucket.com/albums/r238/Marksac/DSCF0417.jpg[/IMG] It Smoked a little bit when It first started, but it worked and sounded great! There were a few things I heard though...it would go at a higher RPM, the go down a bit, then back up.... And, I had to keep the choke at a sertian spot or else the engine died out. Could that be from not getting enough gas? And if it is about not getting gas, could it be from the way I ran the fuel line? These are the better pics of how I ran it... [IMG]http://i145.photobucket.com/albums/r238/Marksac/DSCF0407.jpg[/IMG] [IMG]http://i145.photobucket.com/albums/r238/Marksac/DSCF0408.jpg[/IMG] And in the manual is shows it going through the Engine cowling and out the back. Less line, less curves. [IMG]http://i145.photobucket.com/albums/r238/Marksac/Engine.jpg[/IMG] So, What should I do? Should I go through the engine? Thank You

[ehertzfeld 1]

I would think that it's a carb adjustment.

[MarksA-C 93]

Well, I do plan on running it through the engine. Just to keep it simple w/o all the curves and such. But, I will work a bit on the carb.

[Ketchamized 2]

Mark, You could test this "curved gas line" theory by hooking up the line straight to a portable tank and see how it runs. Usually when you have a engine surging like that, it's the governor. The spring is too weak and keeps surging. Either that, or the teeth holding the governor arm is gone. (Or the bolt clamping it in place is loose) Carb adjustment is a possibility, could mean that gas is getting to the engine, but not steadily. Could be a bad float, clogged main jet, or gunk in the gas. You can test the bad governor theory by starting the engine and hold the governor steadily with your hand and keep it in one spot while idle. If it stays running without any problems, then it is the governor. But if it keeps doing that, despite the fact that your hand is holding it in place, then it's something else.

[SmilinSam 4,157]

Looks like you are running the fuel line down then up at the mid level of the tank or better. If its gravity feed you are going to have problems. You may need a fuel pump if you dont have one already at the engine.

[MarksA-C 93]

I desided to run the line through the engine, and it actually runs a bit better. Not as much surging but it still has the choke/throttle problems. I also found a whole bunch of grass inside the right cylinder cooling fins. So I got that cleaned out, and all the funs are clean.

[kidnoslo 0]

Most likely a carb problem. The fact that it improved when you chokes it a bit indicates this. The rectangular box on the front of the carb is a fuel pump, so it probably wasn't the fuel line routing. These carbs are banned by the EPA so it may be difficult to find a kit. I clean most of my carbs without kits. Just take care when taking them apart not to damage gaskets and o'rings. If it was sitting with ethanol fuel, it will need the jets cleaned with carburetor drill bits (numbered 61 thru 80). Push them through do not put in a drill. Start small like #75 and work up till you can't easily push one through. Work it in and out placing lateral pressure as you do 360 degrees. I had the same engine in a MTD and had to clean the gas tank out also. Good Luck, Dick Olson.